Ten-Lens Optical Imaging System for Low-Light Resolution
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Solution Overview
Problem
Conventional optical imaging systems struggle to achieve high-resolution imaging in low-light environments due to limitations in f-number and angle of view, making it difficult to capture clear images in darkly illuminated areas.
Innovation Solution
The optical imaging system comprises a sequence of lenses with specific refractive powers and geometrical configurations, including a second lens with negative refractive power, third lens with negative refractive power, and fifth lens with positive refractive power, optimized to satisfy various conditional expressions that enhance imaging capabilities in low-light conditions by maintaining a low f-number and wide angle of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical imaging systems are used, then the structure is simple, but high-resolution imaging in low-light environments cannot be achieved
Solution Approach 1:
The optical imaging system divides the optical path into multiple segments with dedicated lenses (first through tenth lenses) each performing specific optical functions. This segmentation allows optimization of light gathering in the low f-number region while maintaining imaging quality across the wide angle of view, enabling high-resolution imaging in low-light conditions without requiring a single complex lens element
Solution Approach 2:
The patent systematically optimizes multiple optical parameters including f-number (maintained at 0.9 or lower), angle of view (100° or wider), and various conditional expressions involving focal lengths and radii of curvature of individual lenses. These parameter changes enable the system to capture more light while maintaining image quality, resolving the contradiction between low-light performance and imaging resolution
2Illumination intensity
If the f-number is reduced to improve low-light imaging, then light gathering ability improves, but optical aberrations increase
Solution Approach 1:
The optical system segments the light gathering and focusing functions across ten separate lenses rather than using a single element. This allows the aperture to be opened wider for better light gathering while intermediate lenses correct the aberrations that would otherwise result, maintaining image quality despite the low f-number
Solution Approach 2:
Several lenses act as intermediary elements between the aperture and the image plane, specifically correcting optical aberrations introduced by the wide aperture. The conditional expressions for radii of curvature and focal lengths of specific lenses ensure that light rays are properly redirected to minimize aberrations while maintaining the low f-number configuration
3Area of stationary object
If the angle of view is widened to capture more scene, then field of view improves, but imaging quality deteriorates
Solution Approach 1:
The wide angle of view is achieved by segmenting the optical system into multiple lenses with progressively optimized field angles. Each lens group handles a portion of the wide field, with conditional expressions ensuring that off-axis rays are properly focused, maintaining imaging quality across the entire wide field of view
Solution Approach 2:
The patent employs asymmetric lens configurations where individual lenses have different shapes and orientations optimized for their specific position in the optical train. This asymmetric design allows the system to handle the complex ray paths required for wide-angle imaging while maintaining sharp focus and minimal distortion across the entire field of view
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables high-quality imaging even in low-light environments with a wide angle of view, effectively addressing the limitations of conventional systems by providing improved resolution and light management.
Implementation Method 1
the second lens has negative refractive power, the third lens has negative refractive power, the fifth lens has positive refractive power
Data Source
AI summary
An optical imaging system is provided. The optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens sequentially disposed from an object side to an imaging side. In the optical imaging system, the second lens has negative refractive power. The optical imaging system satisfies the following conditional expressions: TTL/(2*ImgHT)<0.66 and 0<f9/f<2.0. In the conditional expressions, TTL is a distance from an object-side surface of the first lens to an image plane, ImgHT is a height of the image plane, f is a focal length of the optical imaging system, and f9 is a focal length of the ninth lens.